Weird iMessage Occurrences

So today, for the second time, I have received a strange notification on iMessage. Whilst browsing Facebook on my iPhone, I get a drop down notification at the top bar, which is a text from my friend. The contents of the text was: "Kenny, you're adopted". Confused (my name is not Kenny), I went to my messages app to look at the conversation. The message was NOT there. When I pulled down my notifications menu from the top of the screen to see it again, it wasn't there either.

What the hell is going on? This is the second time this has happened today; a random message or notification that doesn't seem to actually exist and has nothing to do with me.

Any input would be appreciated. And no, I'm 100% sure I'm not hallucinating now; the first time I thought was me seeing things but this time it was there for sure.

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